Member Avatar for ankit1122

may i know what are the advantages of making a webpage available like xyz.domainname.com instead of domainname.com/xyz..
if there are any advantages let me know and how can i acomplish???

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Good thread so far — , and hit the main pros/cons. The practical takeaway: subdomains (seller.example.com) are a common, workable pattern for marketplaces, but they bring operational and SEO tradeoffs compared with folders (example.com/seller). The notes below fill in how to implement seller subdomains and what to watch for today.

Start with DNS + routing. Create a wildcard DNS record (*.example.com) pointing to your load‑balancer. Configure your HTTP gateway (Nginx/HAProxy/Caddy/Traefik) to accept all subdomains and forward the Host header to your app. In the app, parse the Host to map the leftmost label to a seller/tenant record and load the right content and permissions. Example (very simple idea):

# nginx: catch-all proxy
server {
  listen 80;
  server_name .example.com;
  location / {
    proxy_set_header Host $host;
    proxy_pass http://app_backend;
  }
}
# node/express: extract tenant slug
app.use((req,res,next) => {
  const host = (req.headers.host || '').split(':')[0];
  req.tenant = host.split('.')[0]; // map to DB
  next();
});

SSL, custom domains and cookies. For many subdomains use a wildcard TLS certificate (*.example.com) or automated per-host certs (ACME). If sellers map their own domains to your platform, you must accept their Host header and provision certs per domain (DNS-01 ACME or a managed TLS service). Share sessions across subdomains by setting cookies with domain .example.com — but be careful: wider cookie scopes increase traffic and attack surface. For static files prefer a cookieless CDN host to avoid sending session cookies with every image.

SEO and crawl considerations. Google treats subdomains as more separate than subfolders, so link authority and sitemaps may not automatically flow. Each subdomain can have its own robots.txt and Search Console property. If SEO consolidation is critical, subfolders tend to concentrate ranking signals. If you change URLs, use 301 redirects, update sitemaps, and monitor Search Console for indexing.

Performance note: older advice to “split resources across domains” arose before HTTP/2. With HTTP/2/3, multiplexing reduces that benefit; domain sharding can hurt TLS/session reuse. Use a CDN and HTTP/2 for best results. Common pitfalls to check: missing wildcard DNS, TLS SNI errors, Host header not forwarded, cookies unintentionally sent to static resources, and separate robots/sitemaps per subdomain.

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Member Avatar for cereal

There are not specific advantages for web pages, but for their components yes: from a performance point of view, serving images (and in general static contents) from different subdomains, will improve the rendering speed of the page. This because browsers limit parallel downloads to two images per domain, so if you have:

domain.tld/images/image001.jpg
domain.tld/images/image002.jpg
domain.tld/images/image003.jpg
domain.tld/images/image004.jpg

Will be downloaded in two rounds, while these:

image001.domain.tld/images/image001.jpg
image001.domain.tld/images/image002.jpg
image002.domain.tld/images/image003.jpg
image002.domain.tld/images/image004.jpg

In one single round. More information:

A part this, I can think to cookies: in past browsers were limiting to 50 to 300 cookies per domain, now the limit changed, but not for smartphones, where the limit is still low, so having multiple subdomains can help you to raise the number of usable cookies.

And there is a lot more if we consider load balancing. It depends a lot in your requirements.

Member Avatar for JorgeM

Also keep in mind that if your URL is already established and indexed by search engines, changing the URL will affect your site's ranking, search engine results, etc...

Member Avatar for ankit1122

how could i do this for my website....im developing an ecommerce site in which seller can show up their items...alibaba.com does the same.. if u are a shopkeeper and u have listed your products ,upon opening up of your site it will open as
companyname.en.alibaba.com..example like this:-
http://nbassist.en.alibaba.com/...
also i have seen this on indian sites also...
can u tell me how must i develop my website architecture so that i can acomplish this above site architecture..

Member Avatar for samjom

Nice questions! Its completely depend on how your web page is important and different from other web pages. E.g. if you have website www.abc.com and you're offering services like web design, SEO etc and apart from that you also offer production services like SEO tools, Website audit tools. So its better you do www.seotools.abc.com instead of www.abc.com/seotools. So your web page entity is completely different from whole website then you should create subdomain instead of domain folder. And if you're changing URL then do not forgot to redirect old URL to new one using 301 redirect.

Member Avatar for ankit1122

so its a seo technique..may i know what's the name of this technique??

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